Millimeter Waveband Filter With Ridge Waveguide And Variable Mirrors
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Solution Overview
Problem
Conventional millimeter waveband filters face challenges in achieving high-sensitivity and high-precision measurements above 100 GHz due to increased noise and conversion loss, with difficulties in separating harmonics and measuring unnecessary emissions, and struggle to realize a wide band including low frequency ranges due to size differences between waveguides, leading to increased insertion loss.
Innovation Solution
A millimeter waveband filter design incorporating a square waveguide and a ridge waveguide with interval variable means, where the ridge waveguide has a central portion with a smaller height than the side portions, and grooves for leakage prevention, allowing for a wider frequency range and reduced insertion loss by adjusting the waveguide dimensions and mirror slit configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the thickness of the second waveguide is decreased to maintain a wide frequency band, then the propagatable frequency range is improved, but the manufacturing strength and ease of manufacture deteriorate
Solution Approach 1:
The invention employs asymmetric waveguide structures where the first waveguide has different dimensions than the second waveguide. Specifically, the first waveguide has a wider width to support lower frequency bands, while the second waveguide has a narrower width optimized for higher frequency bands. This asymmetric configuration allows each waveguide to be optimized for its specific frequency range without requiring the second waveguide to be excessively thin, thus maintaining manufacturability while achieving wide band coverage.
2Device complexity
If the size of the second waveguide is reduced to accommodate insertion into the first waveguide, then the filter structure is achieved, but the lower limit frequency increases and the low frequency band is narrowed
Solution Approach 1:
The invention divides the waveguide system into two distinct segments: a first waveguide optimized for lower frequency bands with larger dimensions, and a second waveguide optimized for higher frequency bands with smaller dimensions. The first waveguide has a width of 2.54mm supporting frequencies down to 50GHz, while the second waveguide has a width of 1.27mm supporting frequencies from 100GHz upward. This segmentation allows each segment to maintain its optimal dimensions for its designated frequency range, preventing the low frequency band from being narrowed while still achieving the required filter structure.
3Strength
If the thickness of the second waveguide is increased to improve strength, then the manufacturing ease is improved, but the frequency at which different modes are excited decreases and insertion loss increases
Solution Approach 1:
The invention applies local quality optimization by giving each waveguide segment specific dimensional characteristics suited to its function. The first waveguide has a larger width (2.54mm) and is optimized for lower frequency propagation with minimal insertion loss in the 50-110GHz range. The second waveguide has a smaller width (1.27mm) and is optimized for higher frequency propagation above 100GHz. By locally optimizing each segment's dimensions rather than using a uniform thickness throughout, the system achieves both mechanical strength and minimal insertion loss at each operating frequency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables a wider band frequency range without limiting the low frequency band, moving the LSE11 mode frequency to a higher band and preventing increased insertion loss, while maintaining low frequency propagation capabilities and reducing electromagnetic wave leakage.
Implementation Method 1
desired frequency components of the millimeter waves are selectively transmitted by a resonance action between a pair of electric wave half mirrors arranged to face each other inside a transmission line allowing propagation in a TE10 mode (single mode)
Data Source
AI summary
In a millimeter waveband filter, electric wave half mirrors are provided in transmission lines of a first waveguide configured to allow electromagnetic waves in a predetermined frequency range of a millimeter waveband to propagate in a TE10 mode and a second waveguide connected to the first waveguide in a state where one end of the second waveguide is inserted into the first waveguide, and the waveguides are relatively moved to vary the interval between the electric wave half mirrors, thereby changing a resonance frequency. The first waveguide is a square waveguide, and the second waveguide is a ridge waveguide in which the outside thereof is a rectangular shape at a predetermined interval with respect to the inside of the first waveguide and a sectional shape of a transmission line has a central portion having a height smaller than both side portions.